US20050022225A1 - Optically readable carrier - Google Patents

Optically readable carrier Download PDF

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Publication number
US20050022225A1
US20050022225A1 US10/491,693 US49169304A US2005022225A1 US 20050022225 A1 US20050022225 A1 US 20050022225A1 US 49169304 A US49169304 A US 49169304A US 2005022225 A1 US2005022225 A1 US 2005022225A1
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US
United States
Prior art keywords
disc
hub
readable
dvd
double
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/491,693
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English (en)
Inventor
Mark Blackford
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of US20050022225A1 publication Critical patent/US20050022225A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor

Definitions

  • This invention relates to an optically readable carrier which is suitable for use in two different types of optical readers, for example, in a CD (compact disc) player and a DVD (digital versatile disc) player.
  • CDs generally comprise a reflective (silvered) layer containing digital information which is read by a laser.
  • CDs are sold in their millions worldwide and are currently the preferred format for listening to music in the home.
  • DVDs were developed more recently than CDs. The advantage of DVDs is that they are capable of storing much more information than CDs.
  • DVDs generally comprise a reflective (silvered) layer and one or more partially reflective or semi-transparent layers. In operation, a laser reads information from each of the partially reflective layers and the reflective (silvered) layer. Furthermore, in DVDs the spacing between adjacent tracks is about half that of the spacing in CDs.
  • DVDs are capable of storing more information than CDs. Accordingly, DVDs are being used increasingly for viewing films and the like in the home. It is expected that DVDs will replace home videos in the same way that CDs have, to a large extent, replaced vinyl records and magnetic cassette tapes. There is an increasingly high demand for DVDs throughout the world.
  • a DVD it is not possible to play a DVD in a standard CD player. This is because standard CD players use lasers having a different focussing distance and a different wavelength compared to DVD players. If, for example, one bought a DVD of a film and wished to listen to the soundtrack in a car CD player, then it would be necessary to buy a CD of the film soundtrack. It is not possible to play the DVD in, for example, a standard car CD player.
  • a standard CD player it is meant a CD player which has not been specially designed or adapted for playing DVDs.
  • the present invention provides a double-sided disc suitable for use in two different types of optical readers, said disc comprising a first side which is readable by a first type of optical reader and a second side which is readable by a second type of optical reader.
  • the present invention provides a double-sided disc suitable for use in a CD player and a DVD player, said disc comprising a first CD-readable side and a second DVD-readable side.
  • the laser In DVD players, in order that the laser is properly focused, there is an optimum distance between the laser and the reflective DVD-readable layer(s) in the DVD. This optimum distance is usually achieved when the silvered reflective DVD-readable layer is 0.6 mm from the outer surface of the disc facing the laser or when a partially reflective DVD-readable layer is 0.3 mm from the outer surface of the disc facing the laser.
  • the partially reflective DVD-readable layer is read in a similar fashion with the laser being refocused.
  • CD players there is an optimum distance between the laser and the reflective CD-readable layer in the CD. This optimum distance is usually achieved when the reflective CD-readable layer is 1.2 mm from the outer surface of the disc facing the laser.
  • the optimum distance between the laser and the CD-readable layer in a CD player is longer than the corresponding distance in a DVD player.
  • CD- and DVD-players are designed to accommodate discs having a thickness of about 1.2 mm.
  • a standard CD bonded to a standard DVD would necessarily be about 1.8 mm thick. Any significant variation from a thickness of 1.2 mm would normally result in instability of the rotating disc.
  • the drive spindle in standard CD players is designed to receive discs which are 1.2 mm thick.
  • the present invention addresses the problem of providing the optimum focussing distances in both a CD player and a DVD player.
  • the disc of the present invention is adapted to receive a removable hub which can be positioned to provide either a CD mode or a DVD mode.
  • the hub may be removable from a central non-readable part of the disc.
  • the surface design of each side of the non-readable part of the disc determines the extent to which the hub protrudes from the disc. Hence, in operation, when the hub rests on a spindle, the laser focussing distance and the mode of operation are ultimately governed by the surface design of each side of the non-readable part of the disc.
  • the double-sided discs of the present invention provide two distinct laser focussing distances, each distance being compatible with the particular format of each side of the disc.
  • the first CD-readable side of the disc comprises a reflective CD-readable layer and the second DVD-readable side of the disc comprises a reflective DVD-layer, in accordance with conventional CD and DVD design.
  • the reflective CD- and DVD-layers are silvered.
  • the reflective CD-readable layer is preferably at a distance of about 1.2 mm from an outer surface of the CD-readable side of the disc.
  • the reflective DVD-readable layer is preferably at a distance of about 0.6 mm from an outer surface of the DVD-readable side of the disc, and a partially reflective DVD-readable layer is included, as is normal for a double sided DVD.
  • the second DVD-readable side of the disc comprises at least one partially reflective DVD-readable layer. More preferably, the number of partially reflective DVD-readable layers is between 1 and 4, in accordance with conventional DVD disc design. More preferably, the number of partially reflective DVD-readable layers is 1 or 2.
  • the double-sided disc of the present invention ideally comprises a substrate layer which defines an outer surface of the disc.
  • the substrate layer may provide scratch-resistance and preferably protects the optically readable layers from damage in normal use.
  • Substrate layers for CDs and DVDs are well known in the art.
  • a double-sided disc according to the present invention has a total thickness of about 1.8 mm. More preferably, the first CD-readable side of the disc has a thickness of about 1.2 mm and the second DVD-readable side of the disc has a thickness of about 0.6 mm.
  • the DVD-readable side of the disc may be manufactured using existing technologies.
  • the CD-readable side of the disc may be manufactured in a conventional manner.
  • a double-sided disc according to the present invention has a diameter of about 12 cm. This is the size of standard CDs and DVDs. However, the present invention would work equally well in other sizes of CDs and DVDs, for example, ‘mini-discs’.
  • the double-sided disc of the present invention may be produced by bonding the two sides of the disc together using conventional bonding methods, such as u.v. or hot-melt bonding.
  • the central non-readable part of the disc may then be finished for accommodating the removable hub.
  • the finishing may involve, for example, drilling additional holes in the central non-readable part of the disc which are shaped to receive friction-fitting projections on the removable hub.
  • the present invention further provides a combination of a double-sided disc as hereinbefore described and a removable hub having a central opening.
  • the opening is for mounting the disc onto a spindle when in use.
  • the hub is positioned in a DVD mode.
  • the hub is preferably positioned so that a surface of the hub lies flush with an outer surface of the disc. It will be understood that in order for a surface of the hub to lie flush with an outer surface of the disc, the central non-readable part of the disc should be recessed to accommodate the hub. Hence, the outer surface (or face) of the DVD-readable side of the disc and a surface of the hub cooperatively form a substantially flat surface when in the DVD mode.
  • the hub may be positioned in a CD mode.
  • the hub is once again preferably positioned so that the surface of the hub lies flush with the first CD-readable side (or face) of the disc.
  • the hub acts as a spacer between the laser and the CD-readable layer of the disc.
  • one surface of the hub has a raised annulus about the central opening.
  • the raised annulus defines partially the central opening of the hub.
  • the hub has a thickness of about 1.2 mm, as measured at the raised annulus.
  • the hub is secured to the disc by a friction-fitting means.
  • a friction-fitting means may comprise at least two spit-pins on the hub which engage with corresponding recesses or openings on the disc.
  • the hub may be secured to the disc by a suitable clip mechanism or a counter-rotational screw fitting.
  • FIG. 1 shows a side view of a combination of a disc and hub according to the present invention in a DVD mode.
  • FIG. 2 shows a side view of a combination of a disc and hub according to the present invention in a CD mode.
  • FIG. 3 shows a plan view of a hub as used in the present invention.
  • a double-sided disc comprises a CD-readable side ( 1 ) and a DVD-readable side ( 2 ).
  • the CD-readable side comprises a reflective CD-readable layer ( 3 ) and a CD outer surface ( 4 ).
  • the DVD-readable side comprises a reflective DVD-readable layer ( 5 ), a partially reflective DVD-readable layer ( 6 ) and a DVD outer surface ( 7 ).
  • a disc in a DVD mode is shown.
  • a hub ( 8 ) is positioned having a hub surface ( 9 ) which lies flush with the DVD outer surface ( 7 ) of the disc.
  • the hub is secured to the disc by means of two split-pins ( 10 ), which engage with corresponding openings in the disc. The engagement prevents the disc from rotating relative to the hub.
  • the hub rests on a spindle (not shown) via its central opening ( 12 ).
  • the central opening ( 12 ) is partly defined by a raised annulus ( 13 ) of the hub. It will be seen that the distance between a laser (not shown) and the DVD-readable layer ( 5 ) is determined by the positioning of the hub relative to the disc.
  • the disc is shown in a CD mode.
  • the hub ( 8 ) is positioned such that it lies flush with the CD-readable side ( 2 ) of the disc with the raised annulus ( 13 ) of the hub engaging the disc.
  • the hub is secured to the disc by means of the two split-pins ( 10 ), which engage with the openings in the disc.
  • the distance between a laser (not shown) and the CD-readable layer ( 3 ) is determined by the positioning of the hub relative to the disc. More particularly, the relative distance between the laser (not shown) and the CD-readable layer ( 3 ) is about 1.2 mm when the hub is positioned in a CD mode and the hub rests on a spindle (not shown).
  • the hub is removable so that the double-sided disc may be used in either a DVD mode ( FIG. 1 ) or a CD mode ( FIG. 2 ).
  • a hub ( 1 ) is shown which is detached from the double-sided disc of the present invention.
  • the hub comprises a central opening ( 12 ), a raised annulus ( 13 ) and two split-pins ( 10 ).

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
US10/491,693 2001-10-02 2002-10-02 Optically readable carrier Abandoned US20050022225A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0123667.8 2001-10-02
GB0123667A GB2380595B (en) 2001-10-02 2001-10-02 An optically readable carrier
PCT/GB2002/004449 WO2003030152A2 (en) 2001-10-02 2002-10-02 An optically readable carrier

Publications (1)

Publication Number Publication Date
US20050022225A1 true US20050022225A1 (en) 2005-01-27

Family

ID=9923115

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/491,693 Abandoned US20050022225A1 (en) 2001-10-02 2002-10-02 Optically readable carrier

Country Status (6)

Country Link
US (1) US20050022225A1 (ja)
EP (1) EP1472684A2 (ja)
JP (1) JP2005505090A (ja)
AU (1) AU2002329439A1 (ja)
GB (1) GB2380595B (ja)
WO (1) WO2003030152A2 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090175154A1 (en) * 2008-01-04 2009-07-09 Nokia Corporation Disk with Embedded Flash Memory and Disc Drive
US20140155807A1 (en) * 2010-05-26 2014-06-05 Ethicon Endo-Surgery, Inc. Intestinal brake inducing intraluminal therapeutic substance eluting devices and methods

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004017316A1 (en) * 2002-08-14 2004-02-26 Mahomy, Frances, Anne Hybrid in width spec optical disc utilising a dvd and a cd side and a method for manufacturing a double density side
EP1505600A1 (en) * 2003-07-30 2005-02-09 Sony DADC Austria AG Disc shaped optical record carrier

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542426A (en) * 1983-05-31 1985-09-17 Storage Technology Partners Ii Flexible hub for removable disk
US5914926A (en) * 1996-06-18 1999-06-22 Sanyo Electric Co., Ltd. Optical recording medium for checking compatibility of an optical pickup device and method of checking an optical pickup device using the same
US6014364A (en) * 1995-05-17 2000-01-11 Nippon Columbia Co., Ltd. Optical information recording medium and method of manufacturing
US6137766A (en) * 1998-04-09 2000-10-24 Sony Corporation Multi-layer disc reproducing apparatus and method
US6141299A (en) * 1998-04-09 2000-10-31 Sony Corporation Apparatus and method for reproducing information data of different formats from a multi-layer optical disc
US6160787A (en) * 1996-01-11 2000-12-12 Wea Manufacturing, Inc. Multiple layer optical recording medium for use with two different wavelength laser beams
US6167023A (en) * 1995-04-07 2000-12-26 Discovision Associates Releasable disc adaptor for conforming central hub of information storage disc to standardized disc drive spindle
US6434107B1 (en) * 1996-06-28 2002-08-13 Thomson Licensing S.A. Optical disk compatible with two different reading systems
US6522620B1 (en) * 1998-03-23 2003-02-18 Warner Music Group, Inc. Dual format optical disc
US6826139B1 (en) * 1997-08-30 2004-11-30 Samsung Electronics Co., Ltd. Hybrid disc and method and apparatus for discriminating same
US6881465B2 (en) * 2001-08-06 2005-04-19 Sanyo Electric Co., Ltd. Optical disk and method of manufacturing thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998038637A1 (en) * 1997-02-28 1998-09-03 Wea Manufacturing, Inc. Two-sided hybrid dvd-cd disc
JP3988236B2 (ja) * 1998-02-13 2007-10-10 ヤマハ株式会社 光ディスク
DE19950707A1 (de) * 1998-12-01 2001-02-01 Dieter Dierks Digitaler optischer Datenträger in Scheibenformat
DK199901096A (da) * 1999-08-05 2001-02-06 Tocano As Kombineret compact disk/digital versatile disk produkt.

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542426A (en) * 1983-05-31 1985-09-17 Storage Technology Partners Ii Flexible hub for removable disk
US6167023A (en) * 1995-04-07 2000-12-26 Discovision Associates Releasable disc adaptor for conforming central hub of information storage disc to standardized disc drive spindle
US6014364A (en) * 1995-05-17 2000-01-11 Nippon Columbia Co., Ltd. Optical information recording medium and method of manufacturing
US6160787A (en) * 1996-01-11 2000-12-12 Wea Manufacturing, Inc. Multiple layer optical recording medium for use with two different wavelength laser beams
US5914926A (en) * 1996-06-18 1999-06-22 Sanyo Electric Co., Ltd. Optical recording medium for checking compatibility of an optical pickup device and method of checking an optical pickup device using the same
US6434107B1 (en) * 1996-06-28 2002-08-13 Thomson Licensing S.A. Optical disk compatible with two different reading systems
US6826139B1 (en) * 1997-08-30 2004-11-30 Samsung Electronics Co., Ltd. Hybrid disc and method and apparatus for discriminating same
US6522620B1 (en) * 1998-03-23 2003-02-18 Warner Music Group, Inc. Dual format optical disc
US6137766A (en) * 1998-04-09 2000-10-24 Sony Corporation Multi-layer disc reproducing apparatus and method
US6141299A (en) * 1998-04-09 2000-10-31 Sony Corporation Apparatus and method for reproducing information data of different formats from a multi-layer optical disc
US6881465B2 (en) * 2001-08-06 2005-04-19 Sanyo Electric Co., Ltd. Optical disk and method of manufacturing thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090175154A1 (en) * 2008-01-04 2009-07-09 Nokia Corporation Disk with Embedded Flash Memory and Disc Drive
US8234667B2 (en) * 2008-01-04 2012-07-31 International Business Machines Corporation Disk with embedded flash memory and disc drive
US8424031B2 (en) 2008-01-04 2013-04-16 International Business Machines Corporation Disc with embedded flash memory and disc drive
US8429682B2 (en) 2008-01-04 2013-04-23 International Business Machines Corporation Disc with embedded flash memory and disc drive
US20140155807A1 (en) * 2010-05-26 2014-06-05 Ethicon Endo-Surgery, Inc. Intestinal brake inducing intraluminal therapeutic substance eluting devices and methods

Also Published As

Publication number Publication date
WO2003030152A3 (en) 2003-06-05
EP1472684A2 (en) 2004-11-03
WO2003030152A2 (en) 2003-04-10
GB2380595A (en) 2003-04-09
JP2005505090A (ja) 2005-02-17
GB2380595B (en) 2005-06-15
GB0123667D0 (en) 2001-11-21
AU2002329439A1 (en) 2003-04-14

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